CONDENSED CONSOLIDATED INTERIM BALANCE SHEETS - USD ($)	Mar. 31, 2021	Sep. 30, 2020
ASSETS, Current
Cash and cash equivalents	$ 151,562,303	$ 56,320,763
Short-term investments (Note 4)	57,034,921	22,011,337
Receivables	293,106	309,538
Prepaids (Note 5)	491,962	1,600,128
Operating lease right-of-use assets (Note 7)	0	55,162
Total current assets	209,382,292	80,296,928
Deposits	277,637	277,637
Operating lease right-of-use assets (Note 7)	341,125	0
Total assets	210,001,054	80,574,565
LIABILITIES, Current
Accounts payable and accrued liabilities (Note 6)	3,085,397	1,144,230
Current portion of operating lease liability (Note 7)	94,294	59,094
Total current liabilities	3,179,691	1,203,324
Derivative liabilities (Note 9)	1,166,462	127,376
Operating lease liability (Note 7)	246,830	0
Total liabilities	4,592,983	1,330,700
Shareholders' equity
Common shares 40,417,857 issued and outstanding (September 30, 2020 - 32,064,411) (Note 10)	276,740,509	131,086,364
Additional paid-in capital (Note 10)	31,208,296	31,204,284
Accumulated other comprehensive loss	(2,076,479)	(2,076,479)
Accumulated deficit	(100,464,255)	(80,970,304)
Total stockholders equity	205,408,071	79,243,865
Total liabilities and shareholders' equity	$ 210,001,054	$ 80,574,565

Amount of lessee's right to use underlying asset under operating lease, current

No definition available.

Name:	epix_OperatingLeaseRightOfUseAssetsCurrent
Namespace Prefix:	epix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.